Sand-table for paper-making machines.



Patented Oct. 3!, I899.

J. H. ANNANDALE.

SAND TABLE FOB PAPER MAKING MACHINES.

(Application filed Dec. 20, 1897.)

(No Model.)

JAMES HUNTER ANNANDALE, OF POLTON, SCOTLAND.

SAND-TABLE FOR PAPER-'MAKING MACHINES.

SPECIFICATION forming part of Letters Patent No. 635,736, dat d O t b31, 1899.

Application filed December 20, 1897. Serial No. 662,713. (No model.)

To whom, it may concern:

Be it known that I, JAMES HUNTER ANNAN- DALE, paper manufacturer, ofPolton Paper Works, Polton, Mid-Lothian, Scotland, have invented certainnew and useful Improvements in Sand Tables or Traps for Paper- MakingMachines, (which have been patented in Great Britain by Letters Patentdated December 11, 1895, No. 23,743,) of which the following is aspecification. A

This invention has for its object the provision of improved means tofacilitate the deposition or precipitation of sand and other particlesof sedimentary foreign matter from paper-pulp on its passage from thebeating- -engine to the strainer or before it passes onto the Wire of apaper-making machine. In the art of paper making stationary sand tablesor boxes are at present used for this purpose and are provided withcross slats or bars to intercept the sedimentary matter which settles inthese tables or boxes; but it is found in practice thata largepercentage of such foreign matter is held in suspension by the pumpwhile it remains in a clotted or flooculent state, and this is depositedon the strainer-plates or onto the wire of the paper-making machine,when owing to the vibratory motion imparted to the wire the pulp isbrought to a more uniform consistency by disintegration of the clottedmasses. The result is that the side of the paper adjacent to the wirecontains the heavy sedimentary matter, while the upper surface containsthe lighter loose floating particles. According to my invention Iovercome this objection by passing the pulp through a sand table or box,to which a vibratory or jogging motion is imparted in a transverse orother direction by any mechanical means, such as by the use of levers ortoggles operated by a rapidly-rotating crank or eccentric, which causesthe breaking up of the clotted masses of the pulp before it passes ontothe wire or at an earlier stage of the manufacture and insures thedeposition of the sand and heavy foreign matter, as well as the moreintimate mixing and better distribution of the component parts of thepulp.

The invention is illustrated in the accompanying drawings, in whichFigure 1 is a longitudinal vertical section, Fig. 2 a cross-section, andFig. 3 a plan, of a sand-table, showing one arrangement of devices forimparting vibratory motion to it.

The improved sand table comprises the usual trough or box A, into whichthe paperpulp is led by an inlet over the part A and thence flows overthe table A toward the outlet end A The table, or the movable part ofit, is supported upon an articulated framing composed of cross bars orbeams B, carried by vertical rods B, jointed to them and to supports atB on the fioor. To the jointed supporting-frame B B, or to brackets B onthe under side of the box A, are jointed the ends of links orconnecting-rods 0, whose op posite ends are attached to cranks D or toeccentrics or cams on a rapidly-rotatin g shaft E, driven by abelt-pulley F or by other means. By the rotation of the shaft Eoscillating or vibratory movem entisimparted to the articulated frameand to the sand-table supported on it, whereby the pulp passing throughthe trough A is kept in a state of tremor and the sedimentary matter init is shaken down or precipitated on the table.

The mechanism for imparting oscillating movement to the sand-table maybe varied in many ways, as may also be the direction of motion.Thejoggingorvibratorymotion may be applied at both ends or only at oneend of the table, a pivot being in the latter case provided at theopposite end, so that jogging motion may be gradually reduced as thepulp flows on.

Instead of being supported from below the table may be suspended fromabove and the vibratory motion either imparted to the table or to theframe on which it is suspended, provided that such motion is transmittedto the table or to such part of it as will communicate the desired shakeor tremor to the pulp.

The vibrating or oscillating sand-table is provided with the usualintercepting crossbars F or with cross-channels to receive thesedimentary deposit, and it is also by preference fitted withlongitudinal division plates or boards G, which serve to better transmitthe vibratory motion of the sides of the box to the mass of pulp flowingalong the middle parts of the sand-table. At or near the outlet end across board or plate H dips into the pulp and forms a trap to skim andintercept floating foreign matter.

ICO

In lieu of vibrating or oscillating the sandof the cross-bars and abovethe same, said table as a whole the longitudinal divisionbars G leavingopenings between their lower boards G or other part may alone bevibrated edges and the bottom of the table substanor oscillated. tiallyas described.

5 Having now described the invention, What Signed at Glasgow, in thecounty of Lan- 15 I claim, and desire to secure by Letters Patark,Scotland, this 1st day of December, 1897;

ent, is- JAMES HUNTER ANNANDALE.

In combination with the vibrating sand- Witnesses: table havingcross-bars to form channels, the WALLACE FAIRWEATHER,

IO longitudinal bars Gr extending transversely J NO. ARMSTRONG, J r;

